Parasitic and Saprophytic Phycomycetes which Invade Planktonic Organisms. I. New Taxa and Records of Chytridiaceous Fungi

SUMMARY

Two new species are described from two lakes and a river in Washtenaw County, Michigan, namely, Rhizophydium pelagicum and Rhizophydium horizontale, parasitic on Colacium sp. and Stephanodiscus sp., respectively. Further details in the life history of Amphicypellus elegans and of a species previously noted by Canter as parasitic on Rhizosolenia eriensis from England are given. New records for the United States are listed for the following taxa: Septolpidium lineare, Rhizophydium planktonicum, Rhizophydium fragilariae, Rhizosiphon anabaenae, Polyphagus ramosus, and Endocoenobium sp.

The author wishes to express his gratitude to Professor F. K. Sparrow for his criticism during the course of this work and in the preparation of this paper, and to Professor H. H. Bartlett of the Botany Department, University of Michigan, for help with the Latin diagnoses.